diff options
| author | Christoph Hellwig <hch@lst.de> | 2024-05-06 06:20:25 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-05-07 07:29:42 -0600 |
| commit | e8b4869bc78da1a71f2a2ab476caf50c1dcfeed0 (patch) | |
| tree | de7b879ae94655a52d6d48a0b7909689fb4572a6 | |
| parent | 81c2168c229bab0665e862937bb476f18cff056d (diff) | |
block: add a blk_alloc_discard_bio helper
Factor out a helper from __blkdev_issue_discard that chews off as much as
possible from a discard range and allocates a bio for it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240506042027.2289826-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | block/blk-lib.c | 50 | ||||
| -rw-r--r-- | include/linux/bio.h | 3 |
2 files changed, 32 insertions, 21 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index 6e54ef140bab..442da9dad042 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -35,31 +35,39 @@ static sector_t bio_discard_limit(struct block_device *bdev, sector_t sector) return round_down(UINT_MAX, discard_granularity) >> SECTOR_SHIFT; } -int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, - sector_t nr_sects, gfp_t gfp_mask, struct bio **biop) +struct bio *blk_alloc_discard_bio(struct block_device *bdev, + sector_t *sector, sector_t *nr_sects, gfp_t gfp_mask) { - struct bio *bio = *biop; + sector_t bio_sects = min(*nr_sects, bio_discard_limit(bdev, *sector)); + struct bio *bio; - while (nr_sects) { - sector_t req_sects = - min(nr_sects, bio_discard_limit(bdev, sector)); + if (!bio_sects) + return NULL; - bio = blk_next_bio(bio, bdev, 0, REQ_OP_DISCARD, gfp_mask); - bio->bi_iter.bi_sector = sector; - bio->bi_iter.bi_size = req_sects << 9; - sector += req_sects; - nr_sects -= req_sects; - - /* - * We can loop for a long time in here, if someone does - * full device discards (like mkfs). Be nice and allow - * us to schedule out to avoid softlocking if preempt - * is disabled. - */ - cond_resched(); - } + bio = bio_alloc(bdev, 0, REQ_OP_DISCARD, gfp_mask); + if (!bio) + return NULL; + bio->bi_iter.bi_sector = *sector; + bio->bi_iter.bi_size = bio_sects << SECTOR_SHIFT; + *sector += bio_sects; + *nr_sects -= bio_sects; + /* + * We can loop for a long time in here if someone does full device + * discards (like mkfs). Be nice and allow us to schedule out to avoid + * softlocking if preempt is disabled. + */ + cond_resched(); + return bio; +} - *biop = bio; +int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, + sector_t nr_sects, gfp_t gfp_mask, struct bio **biop) +{ + struct bio *bio; + + while ((bio = blk_alloc_discard_bio(bdev, §or, &nr_sects, + gfp_mask))) + *biop = bio_chain_and_submit(*biop, bio); return 0; } EXPORT_SYMBOL(__blkdev_issue_discard); diff --git a/include/linux/bio.h b/include/linux/bio.h index 283a0dcbd1de..d5379548d684 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -833,4 +833,7 @@ struct bio *blk_next_bio(struct bio *bio, struct block_device *bdev, unsigned int nr_pages, blk_opf_t opf, gfp_t gfp); struct bio *bio_chain_and_submit(struct bio *prev, struct bio *new); +struct bio *blk_alloc_discard_bio(struct block_device *bdev, + sector_t *sector, sector_t *nr_sects, gfp_t gfp_mask); + #endif /* __LINUX_BIO_H */ |